//==========================================================================
//
//      crc.h
//
//      Interface for the CRC algorithms.
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 2002, 2009 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    Andrew Lunn
// Contributors: Andrew Lunn
// Date:         2002-08-06
// Purpose:
// Description:
//
// This code is part of eCos (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================

#ifndef _SERVICES_CRC_CRC_H_
#define _SERVICES_CRC_CRC_H_

#include <cyg/infra/cyg_type.h>

#ifndef __externC
	#ifdef __cplusplus
		#define __externC extern "C"
	#else
		#define __externC extern
	#endif
#endif

// Compute a CRC, using the POSIX 1003 definition

__externC cyg_uint32
cyg_posix_crc32(unsigned char* s, int len);

// Gary S. Brown's 32 bit CRC

__externC cyg_uint32
cyg_crc32(unsigned char* s, int len);

// Gary S. Brown's 32 bit CRC, but accumulate the result from a
// previous CRC calculation

__externC cyg_uint32
cyg_crc32_accumulate(cyg_uint32 crc, unsigned char* s, int len);

// Ethernet FCS Algorithm

__externC cyg_uint32
cyg_ether_crc32(unsigned char* s, int len);

// Ethernet FCS algorithm, but accumulate the result from a previous
// CRC calculation.

__externC cyg_uint32
cyg_ether_crc32_accumulate(cyg_uint32 crc, unsigned char* s, int len);

// 16 bit CRC with polynomial x^16+x^12+x^5+1

__externC cyg_uint16
cyg_crc16(unsigned char* s, int len);

__externC cyg_uint16
cyg_crc16_accumulate(cyg_uint16 crc, unsigned char* s, int len);

#endif // _SERVICES_CRC_CRC_H_



